US6322018B1 - Lockbar for a seatbelt retractor - Google Patents

Lockbar for a seatbelt retractor Download PDF

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Publication number
US6322018B1
US6322018B1 US09/542,323 US54232300A US6322018B1 US 6322018 B1 US6322018 B1 US 6322018B1 US 54232300 A US54232300 A US 54232300A US 6322018 B1 US6322018 B1 US 6322018B1
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US
United States
Prior art keywords
lockbar
end pieces
joining member
seatbelt retractor
retractor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/542,323
Inventor
Alan George Smithson
David Blackadder
Paul Bowman
Joseph Patrick Harte
John Taylor
Nigel Mitchinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joyson Safety Systems Inc
Original Assignee
Breed Automotive Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Breed Automotive Technology Inc filed Critical Breed Automotive Technology Inc
Assigned to BREED AUTOMOTIVE TECHNOLOGY, INC. reassignment BREED AUTOMOTIVE TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MITCHINSON, NIGEL, HARTE, JOSEPH PATRICK, TAYLOR, JOHN, BLACKADDER, DAVID, BOWMAN, PAUL, SMITHSON, ALAN GEORGE
Assigned to CONGRESS FINANCIAL CORPORATION (FLORIDA) reassignment CONGRESS FINANCIAL CORPORATION (FLORIDA) SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BREED AUTOMOTIVE TECHNOLOGY, INC.
Application granted granted Critical
Publication of US6322018B1 publication Critical patent/US6322018B1/en
Assigned to BREED AUTOMOTIVE TECHNOLOGY, INC. reassignment BREED AUTOMOTIVE TECHNOLOGY, INC. RELEASE OF SECURITY INTEREST IN TRADEMARKS Assignors: CONGRESS FINANCIAL CORPORATION
Assigned to CITICORP USA, INC., AS TERM C LOAN COLLATERAL AGENT AND CITICORP USA, INC. AS ADMINISTRATIVE AGENT reassignment CITICORP USA, INC., AS TERM C LOAN COLLATERAL AGENT AND CITICORP USA, INC. AS ADMINISTRATIVE AGENT SECURITY AGREEMENT Assignors: BREED AUTOMOTIVE TECHNOLOGY, INC.
Assigned to KEY SAFETY SYSTEMS, INC. reassignment KEY SAFETY SYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BREED AUTOMOTIVE TECHNOLOGY, INC.
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. SECURITY AGREEMENT Assignors: AEGIS KEY CORP, BREED AUTOMOTIVE TECHNOLOGY, INC, HAMLIN ELECTRONICS LIMITED PARTNERSHIP, HAMLIN INCORPORATED, KEY ASIAN HOLDINGS, INC, KEY AUTOMOTIVE ACCESSORIES, INC, KEY AUTOMOTIVE OF FLORIDA, INC, KEY AUTOMOTIVE WEST, INC, KEY AUTOMOTIVE, LP, KEY CAYMAN GP LLC, KEY ELECTRONICS OF NEVADA, INC, KEY INTERNATIONAL MANUFACTURING DEVELOPMENT CORPORATION, KEY SAFETY RESTRAINT SYSTEMS, INC, KEY SAFETY SYSTEMS FOREIGN HOLDCO, LLC, KEY SAFETY SYSTEMS OF TEXAS, INC, KEY SAFETY SYSTEMS, INC, KSS ACQUISITION COMPANY, KSS HOLDINGS, INC
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency

Definitions

  • the present invention relates to a seatbelt retractor, and specifically to a lockbar for a seatbelt retractor.
  • a seatbelt generally comprises belt webbing that passes over a vehicle occupant's torso to restrain forward movement in a crash.
  • the webbing is wound on a spool that is mounted in the retractor for rotation about its longitudinal axis to wind in or pay out webbing.
  • the spool is biased in a winding in direction by a spiral spring.
  • a sensor detects a crash, for example by detecting acceleration or deceleration above a predetermined level. The crash sensor activates a locking mechanism to lock the spool against rotation and prevent further pay out of webbing thus restraining the occupant against forward motion.
  • the spool is locked by engagement of teeth on a ratchet wheel on the edge of the spool with a locking pawl.
  • a locking pawl Often two locking pawls are used mounted at opposite ends of a bar extending the length of the spool so as to lock both ends simultaneously.
  • Such a lockbar is traditionally made in one piece of a single type of material, for example as a metal die casting.
  • the present invention provides an improved lockbar for a seatbelt retractor and an improved method of manufacturing or assembling a lockbar.
  • the joining member may be made by extrusion and may be tubular or may be formed as a hollow member, for example, of prismatic form (i.e., with a triangular cross-section). It is preferably designed to have relatively high torsional and axial stiffness but can be made of relatively low strength material such as aluminum or glass-filled plastic.
  • the end pieces may be produced as forgings, die casting or plastic injection moldings or by other suitable methods. They can be produced from different materials and to different designs to suit the specification of the seatbelt retractor. For example, forged aluminum or steel end pieces are envisaged. These materials have a higher mechanical strength and a better metallurgical microstructure than die cast parts.
  • the joining member may be hollow along its whole length or at its end to accommodate projections on the end pieces in the form of bars or pins.
  • extending pins on the ends of the joining member may fit into holes in the end pieces.
  • the joints may be made stronger by pressing, spot welding, riveting, over molding, over casting and/or by using adhesive.
  • the end pieces also generally comprise pin formations for guidance purposes that interact with features in the retractor mechanism to move the end pieces into locking positions. These may be formed as separate pieces and inserted or otherwise attached. They may be formed by pressing out, semi-shearing, over molding, over casting, cold forging, friction welding or other suitable methods.
  • FIG. 1 is an isometric view of a seatbelt retractor incorporating a lockbar according to one embodiment of the present invention
  • FIG. 2 is an exploded isometric view of the lockbar shown in FIG. 1;
  • FIG. 4 is an exploded isometric view of a third embodiment of a lockbar according to the present invention.
  • FIG. 1 shows a seatbelt retractor comprising a frame 1 , with cut-outs in the sides 2 supporting a spool 3 for rotation about its longitudinal axis.
  • Ratchet teeth 4 are arranged around the circumference of each end of the spool 3 .
  • a lockbar 5 extends across frame 1 and has locking teeth 6 to engage the ratchet teeth 4 in the locking position when a crash is indicated in known manner.
  • the lockbar 5 comprises two end pieces 7 on which the locking teeth 6 are formed, and a central elongate joining member 8 .
  • the end pieces 7 have holes 9 into which pins 10 fit extending from the ends of the elongate joining member 8 in a permanent manner.
  • the pins may be glued, crimped, pressed or welded to fix the end pieces 7 to the joining member 8 .
  • Other methods of fixing can also be used as will be evident to persons skilled in the art depending upon the materials used and the strength and specification required.
  • the longer pair of pins 10 are also used a pivot features for the rotational datum of the lockbar assembly.
  • the embodiment of the lockbar shown in FIG. 4 and FIG. 5 has a tubular prismatic joining member 8 .
  • Corresponding shaped extensions are formed at the end pieces 7 so as to fit into the ends of the joining member 8 .
  • the end pieces 7 are forged from aluminum and the joining member 8 is extruded aluminum.

Abstract

A lockbar for a seatbelt retractor has an elongate joining member and two end pieces joined to the joining member at opposite ends therefore. The end pieces are made of a higher strength material than the joining member. The joining member may be made by extrusion and may be tubular or may be formed as a hollow member. The end pieces may be produced as forgings, die casting or plastic injection moldings or by other suitable methods. They can be produced from different materials and to different designs to suit the specification of the seatbelt retractor. Hence a single basic seatbelt retractor design can be employed for a variety of strength requirements by selecting appropriate end pieces and an appropriate joining member.

Description

FIELD OF THE INVENTION
The present invention relates to a seatbelt retractor, and specifically to a lockbar for a seatbelt retractor.
BACKGROUND OF THE INVENTION
A seatbelt generally comprises belt webbing that passes over a vehicle occupant's torso to restrain forward movement in a crash. The webbing is wound on a spool that is mounted in the retractor for rotation about its longitudinal axis to wind in or pay out webbing. The spool is biased in a winding in direction by a spiral spring. A sensor detects a crash, for example by detecting acceleration or deceleration above a predetermined level. The crash sensor activates a locking mechanism to lock the spool against rotation and prevent further pay out of webbing thus restraining the occupant against forward motion.
The spool is locked by engagement of teeth on a ratchet wheel on the edge of the spool with a locking pawl. Often two locking pawls are used mounted at opposite ends of a bar extending the length of the spool so as to lock both ends simultaneously. Such a lockbar is traditionally made in one piece of a single type of material, for example as a metal die casting.
However, die cast parts are inherently rather weak and the traditional U-shaped lockbar is complex to manufacture.
The present invention provides an improved lockbar for a seatbelt retractor and an improved method of manufacturing or assembling a lockbar.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a lockbar for a seatbelt retractor comprising at least three parts separately manufactured and subsequently connected together.
According to a preferred embodiment of the present invention, the lockbar comprises an elongate joining member and two end pieces joined to the joining member at opposite ends therefore, the end pieces being made of a higher strength material than the joining member. In one embodiment the end pieces are of a generally L-shaped form.
The joining member may be made by extrusion and may be tubular or may be formed as a hollow member, for example, of prismatic form (i.e., with a triangular cross-section). It is preferably designed to have relatively high torsional and axial stiffness but can be made of relatively low strength material such as aluminum or glass-filled plastic.
The end pieces may be produced as forgings, die casting or plastic injection moldings or by other suitable methods. They can be produced from different materials and to different designs to suit the specification of the seatbelt retractor. For example, forged aluminum or steel end pieces are envisaged. These materials have a higher mechanical strength and a better metallurgical microstructure than die cast parts.
Hence a single basic seatbelt retractor design can be employed for a variety of strength requirements by selecting appropriate end pieces and an appropriate joining member.
The end pieces, being either generally flat or L-shaped are easier to manufacture than the traditional one piece U-shaped lockbar.
The end pieces may be attached to the joining member in a variety of ways to suit the strength requirements and the materials from which the parts are made.
For example, the joining member may be hollow along its whole length or at its end to accommodate projections on the end pieces in the form of bars or pins. Alternatively, extending pins on the ends of the joining member may fit into holes in the end pieces. The joints may be made stronger by pressing, spot welding, riveting, over molding, over casting and/or by using adhesive.
The end pieces also generally comprise pin formations for guidance purposes that interact with features in the retractor mechanism to move the end pieces into locking positions. These may be formed as separate pieces and inserted or otherwise attached. They may be formed by pressing out, semi-shearing, over molding, over casting, cold forging, friction welding or other suitable methods.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made by way of example to the accompanying drawings in which:
FIG. 1 is an isometric view of a seatbelt retractor incorporating a lockbar according to one embodiment of the present invention;
FIG. 2 is an exploded isometric view of the lockbar shown in FIG. 1;
FIG. 3 is an exploded isometric view of a second embodiment of a lockbar according to the present invention;
FIG. 4 is an exploded isometric view of a third embodiment of a lockbar according to the present invention; and
FIG. 5 is a cross-sectional view of the lockbar of FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a seatbelt retractor comprising a frame 1, with cut-outs in the sides 2 supporting a spool 3 for rotation about its longitudinal axis. Ratchet teeth 4 are arranged around the circumference of each end of the spool 3.
A lockbar 5 extends across frame 1 and has locking teeth 6 to engage the ratchet teeth 4 in the locking position when a crash is indicated in known manner.
As can be seen more clearly in FIG. 2 and FIG. 5, the lockbar 5 comprises two end pieces 7 on which the locking teeth 6 are formed, and a central elongate joining member 8.
In the lockbar of FIG. 2, the end pieces 7 have holes 9 into which pins 10 fit extending from the ends of the elongate joining member 8 in a permanent manner. The pins may be glued, crimped, pressed or welded to fix the end pieces 7 to the joining member 8. Other methods of fixing can also be used as will be evident to persons skilled in the art depending upon the materials used and the strength and specification required. The longer pair of pins 10 are also used a pivot features for the rotational datum of the lockbar assembly.
In the lockbar of FIG. 3 the end pieces are again fixed by pins 10 extending through holes 9. Additionally, two further pins 11 are provided at each end of the joining member 8. These fit through cut-outs 12 on each end piece 7 so as to extend, after assembly, beyond the end pieces 7 and provide the necessary mechanism by which the lockbar is pivoted to bring the teeth 6 into engagement with the ratchet teeth on the spool 3 in the event of a crash.
The embodiment of the lockbar shown in FIG. 4 and FIG. 5 has a tubular prismatic joining member 8. Corresponding shaped extensions are formed at the end pieces 7 so as to fit into the ends of the joining member 8. The end pieces 7 are forged from aluminum and the joining member 8 is extruded aluminum.
It is understood that the invention is not limited to the particular construction and arrangement of parts herein illustrated and described, but embraces such modified forms thereof as come within the scope of the following claims.

Claims (16)

We claim:
1. A lockbar for a seatbelt retractor comprising
an elongate joining member and
two end pieces joined to the joining member at opposite ends, the end pieces being made of a higher strength material than the joining member, both end pieces comprising the same material.
2. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces are of a generally L-shaped form.
3. The lockbar for a seatbelt retractor according to claim 1 wherein the joining member is an extrusion.
4. The lockbar for a seatbelt retractor according to claim 3 the joining member is tubular.
5. The lockbar for a seatbelt retractor according to claim 3 wherein the joining member is hollow.
6. The lockbar for a seatbelt retractor according to claim 5 wherein the joining member has a triangular cross-section.
7. The lockbar for a seatbelt retractor according to claim 1 wherein the joining member comprises aluminum.
8. The lockbar for a seatbelt retractor according to claim 1 wherein the joining member comprises glass-filled plastic.
9. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces are forged.
10. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces are die cast.
11. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces are injection molded plastic.
12. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces are forged aluminum.
13. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces are forged steel.
14. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces have projections and the joining member is hollow at least at its ends and to accommodate said projections on the end pieces to attach the end pieces to the joining member.
15. The lockbar for a seatbelt retractor according to claim 1 wherein the joining member has projections and the end pieces have holes therein to accommodate said projections on the joining member pieces to attach the end pieces to the joining member.
16. The lockbar for a seatbelt retractor according to claim 1 wherein the end pieces further comprise pin formations for guidance purposes that interact with features in a retractor mechanism to guide the end pieces into locking positions.
US09/542,323 1999-09-17 2000-04-04 Lockbar for a seatbelt retractor Expired - Fee Related US6322018B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9922104 1999-09-17
GB9922104A GB2354206B (en) 1999-09-17 1999-09-17 Retractor

Publications (1)

Publication Number Publication Date
US6322018B1 true US6322018B1 (en) 2001-11-27

Family

ID=10861169

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/542,323 Expired - Fee Related US6322018B1 (en) 1999-09-17 2000-04-04 Lockbar for a seatbelt retractor

Country Status (9)

Country Link
US (1) US6322018B1 (en)
EP (1) EP1212216B1 (en)
JP (1) JP2003509287A (en)
KR (1) KR100465252B1 (en)
BR (1) BR0014013A (en)
DE (1) DE60012945T2 (en)
GB (1) GB2354206B (en)
MX (1) MXPA02002700A (en)
WO (1) WO2001021457A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060186252A1 (en) * 2005-02-21 2006-08-24 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device
US20130221148A1 (en) * 2010-11-11 2013-08-29 Fasching Salzburg Gmbh Locking unit with end-position locking catch for a seatbelt retractor
USD802844S1 (en) * 2015-04-16 2017-11-14 Fasching Salzburg Gmbh Safety belt for the seats of vehicles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4308699B2 (en) * 2004-04-09 2009-08-05 株式会社東海理化電機製作所 Webbing take-up device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050644A (en) * 1974-01-22 1977-09-27 Foehl Artur Inertia responsive control device
DE3144340A1 (en) 1981-01-23 1982-08-19 Naamloze Vennootschap Klippan S.A., 3030 Heverlee Belt-reeling device for safety belts
DE9413087U1 (en) 1994-08-12 1994-10-06 Icsrd Rueckhaltesysteme Fuer F Blocking pawl for blocking a belt reel of a seat belt retractor
US5388780A (en) * 1992-08-05 1995-02-14 Nsk Ltd. Seat belt retractor
WO1995006576A1 (en) 1993-08-30 1995-03-09 Alliedsignal Inc. Seat belt retraction mechanism
DE29807433U1 (en) 1998-04-23 1998-08-20 Trw Repa Gmbh Belt retractor for a seat belt restraint system
EP0917999A2 (en) 1997-11-24 1999-05-26 TRW Occupant Restraint Systems GmbH & Co. KG Seat belt retractor for fitting to the back of a folding seat
EP0919441A2 (en) 1997-11-26 1999-06-02 Trw Vehicle Safety Systems Inc. Vehicle occupant restraint
GB2347900A (en) 1999-03-15 2000-09-20 Breed Automotive Tech Seat Belt Retractor

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050644A (en) * 1974-01-22 1977-09-27 Foehl Artur Inertia responsive control device
DE3144340A1 (en) 1981-01-23 1982-08-19 Naamloze Vennootschap Klippan S.A., 3030 Heverlee Belt-reeling device for safety belts
US5388780A (en) * 1992-08-05 1995-02-14 Nsk Ltd. Seat belt retractor
WO1995006576A1 (en) 1993-08-30 1995-03-09 Alliedsignal Inc. Seat belt retraction mechanism
DE9413087U1 (en) 1994-08-12 1994-10-06 Icsrd Rueckhaltesysteme Fuer F Blocking pawl for blocking a belt reel of a seat belt retractor
EP0917999A2 (en) 1997-11-24 1999-05-26 TRW Occupant Restraint Systems GmbH & Co. KG Seat belt retractor for fitting to the back of a folding seat
EP0919441A2 (en) 1997-11-26 1999-06-02 Trw Vehicle Safety Systems Inc. Vehicle occupant restraint
DE29807433U1 (en) 1998-04-23 1998-08-20 Trw Repa Gmbh Belt retractor for a seat belt restraint system
EP0952048A1 (en) 1998-04-23 1999-10-27 TRW Occupant Restraint Systems GmbH & Co. KG Seat belt retractor for a safety belt restraint system
US6241173B1 (en) * 1998-04-23 2001-06-05 Trw Occupant Restraint Systems Gmbh & Co. Kg Belt retractor for a safety belt restraint system
GB2347900A (en) 1999-03-15 2000-09-20 Breed Automotive Tech Seat Belt Retractor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060186252A1 (en) * 2005-02-21 2006-08-24 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device
US7971820B2 (en) * 2005-02-21 2011-07-05 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device
US20130221148A1 (en) * 2010-11-11 2013-08-29 Fasching Salzburg Gmbh Locking unit with end-position locking catch for a seatbelt retractor
US9302647B2 (en) * 2010-11-11 2016-04-05 Fasching Salzburg Gmbh Locking unit with end-position locking catch for a seatbelt retractor
USD802844S1 (en) * 2015-04-16 2017-11-14 Fasching Salzburg Gmbh Safety belt for the seats of vehicles

Also Published As

Publication number Publication date
BR0014013A (en) 2002-05-21
EP1212216A1 (en) 2002-06-12
DE60012945T2 (en) 2005-08-11
WO2001021457A1 (en) 2001-03-29
KR100465252B1 (en) 2005-01-13
GB9922104D0 (en) 1999-11-17
EP1212216B1 (en) 2004-08-11
MXPA02002700A (en) 2002-07-30
KR20020037759A (en) 2002-05-22
GB2354206A (en) 2001-03-21
DE60012945D1 (en) 2004-09-16
JP2003509287A (en) 2003-03-11
GB2354206B (en) 2001-11-21

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